I need to register a redirect_uri to be able to reauthorize our api client

I updated our password for our taboola login. This caused our API Client's tokens to fail due to a mismatch signature. When I tried to reauthorize our client credentials using authorization code flow, I got the response below stating we have not set a redirect_uri

OAuth Error
error="invalid_grant", error_description="Invalid redirect: does not match one of the registered values: [no-approved-redirects]"

Can someone from Taboola Backstage-API support reply back to me and provide guidance on how to set a redirect_uri?